Extracting NetLog inner classes into their own classes.

headless/lib/browser/headless_devtools.cc

Index: headless/lib/browser/headless_devtools.cc
diff --git a/headless/lib/browser/headless_devtools.cc b/headless/lib/browser/headless_devtools.cc
index b33b8e9d327f880cc63de32a151729458d3eff6f..ea97afcc96a23a1be728d3a427b9a376694b9125 100644
--- a/headless/lib/browser/headless_devtools.cc
+++ b/headless/lib/browser/headless_devtools.cc
@@ -16,6 +16,7 @@
 #include "headless/grit/headless_lib_resources.h"
 #include "headless/public/headless_browser.h"
 #include "net/base/net_errors.h"
+#include "net/log/net_log_source.h"
 #include "net/socket/tcp_server_socket.h"
 #include "ui/base/resource/resource_bundle.h"
 
@@ -36,7 +37,7 @@ class TCPServerSocketFactory : public content::DevToolsSocketFactory {
   // content::DevToolsSocketFactory implementation:
   std::unique_ptr<net::ServerSocket> CreateForHttpServer() override {
     std::unique_ptr<net::ServerSocket> socket(
-        new net::TCPServerSocket(nullptr, net::NetLog::Source()));
+        new net::TCPServerSocket(nullptr, net::NetLogSource()));
     if (socket->Listen(endpoint_, kBackLog) != net::OK)
       return std::unique_ptr<net::ServerSocket>();